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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping
The carrying value and fair value of the Company’s long-term debt and other financing arrangements are as follows: 
 
March 31, 2012
 
December 31, 2011
(dollars in millions)
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Long-term debt, including current portion
$
2,531.2

 
$
2,472.8

 
$
2,533.6

 
$
2,460.5

Other financing arrangements
$
48.2

 
$
48.3

 
$
47.9

 
$
47.2